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Bienvenue!
Je suis un ancien membre du Laboratoire Univers et Théories, y ayant effectué ma thèse de doctorat de septembre 2006 à juin 2009, puis une année en tant que chercheur post-doctoral de juillet 2009 à septembre 2010. J'ai ensuite continué mes recherches de septembre 2010 à avril 2012 dans le département de physique de l'Université de Basel (Suisse), en collaboration avec le Pr Matthias Liebendoerfer, en tant qu'assistant de recherche.
Mes sujets de recherche incluent:
- L'étude de formulations adaptées pour les Equations d'Einstein, et de méthodes performantes de résolution numérique pour ces équations, utilisant les méthodes spectrales (voir la bibliothèque numérique LORENE (www.lorene.obspm.fr)).
- La caractérisation de la géométrie quasi-locale des horizons de trous noirs ; le lien avec leur dynamique générale ainsi que les propriétés globales de l'espace-temps.
- L'étude de conditions initiales quasi-stationnaires pour des espace-temps de trous noirs en relativité générale complète.
- La modélisation numérique des collapsars, phase dynamique violente accompagnant la fin de vie d'étoiles très massives, et menant à la formation de trous noirs stellaires.
- Les différents aspects de la formation et de la dynamique des régions de trous noirs, incluant l'interaction trou noir-matière (hydrodynamique en relativité générale), l'émission d'ondes gravitationnelles, et la dynamique des horizons de trous noirs.
- Les aspects liés au transport radiatif de neutrinos dans l'environnement des collapsars, mais aussi des supernovae en général, utilisant des modèles efficaces pour le transport radiatif.
Voici un lien vers mon CV académique (au 1r décembre 2010).
Welcome!
I am a former member of the Laboratoire Univers et Théories, having prepared my doctoral thesis there from September 2006 to June 2009, and then been employed as a post-doctoral researcher from July 2009 to September 2010. I then pursued my research from September 2010 to April 2012 in the physics departement of Basel University (Switzerland), in collaboration with Pr Liebendoerfer, as a research assistant.
My research focuses on:
- Study of adapted formulations for Einstein Equations, and accurate numerical methods to tackle them (see the numerical library LORENE (www.lorene.obspm.fr)).
- Characterization of local geometry for black hole horizons; link to their general dynamics and global properties of spacetime.
- Study of initial conditions in quasi-stationarity for black hole spacetimes in full general relativity.
- Modelling of black hole formation by astrophysical core collapse.
- Numerical modelling of collapsars, that are violent dynamical systems forming at the end of the life of very massive stars, and leading to the formation of stellar black holes.
- Different aspects of black hole formation and dynamics, such as black-hole matter interactions (general-relativistic hydrodynamics), gravitational-wave emission, and horizon dynamics.
-Models for radiative transport of neutrinos in collapsars and in supernovae in general, that are either effective models are more sophisticated ones. A work towards a treatment of the transport equation using spectral methods in generalized spherical coordinates has been developed in 2011.
Here is a link to my resume (updated December 1st, 2010).
Key publications:
Magnetorotationally driven Supernovae as the origin of early galaxy r-process elements? C. Winteler, R. Kaeppeli, A. Perego, A. Arcones, N. Vasset, N. Nishimura, M. Liebendoerfer, F.K Thileman, ApJS, in press, http://arxiv.org/abs/1203.0616.
A mathematical description of the IDSA for supernova neutrino transport, its discretization and a comparison with a finite volume scheme for Boltzmann's equation, H. Berninger, E. Frénod, M.J. Gander, M. Liebendoerfer, J. Michaud, N. Vasset, ESAIM proceedings 2012.
Solving the transport equation by the use of 6D spectral methods in spherical geometry , S. Bonazzola and N. Vasset, http://arxiv.org/abs/1104.5330
- A spectral method for the wave equation of divergence-free vectors and symmetric tensors inside a sphere, J. Novak, J.L. Cornou, N. Vasset. Reference: Journal of Computational Physics 229:399-414, 2010. http://arxiv.org/abs/0905.2048
Excised black hole spacetimes: quasi-local horizon formalism applied to the Kerr example, N. Vasset, J. Novak, J.L Jaramillo. Reference: Physical Review D. 79, 124010 (2009). http://arxiv.org/abs/0901.2052
A numerical study of Penrose-like inequalities in a family of axially symmetric initial data, J.L Jaramillo, N. Vasset, M. Ansorg, Reference: Contribution to the 30th Spanish relativity meeting (ERE), Salamanca, EAS Publication series, 30, 257-260, 2008. http://arxiv.org/abs/0712.1741
Conference talks
SN2NS seminar, Meudon Observatory (France), Apr. 2012:
MHD Jet formation in supernovae: numerical approaches
Astrophysics Journal Club, University of Basel (Switzerland), May 2011:
Black holes and the leaking faucet in your bathroom
Laboratoire Jacques Louis Lions, Univ. Pierre et Marie Curie (Paris, France), Nov. 2010:
Neutrino transport in 6D spherical coordinates using spectral methods
19th international conference in general relativity and gravitation (GR19), Mexico City, July 2010.
Computing dynamical black hole spacetimes using quasilocal horizon structures
GPhys Colloquium (Paris, France), June 2010:
Gravitational collapse to black holes: precise computations using dynamical horizons.
University of Tours (France), department of physics, April 29 2010:
Computing black hole horizons geometry and dynamics
Albert Einstein Institute (Golm, Germany), department of numerical relativity, March 18 2010:
Computing black hole horizons geometry and dynamics
University of Basel (Switzerland), Department of physics, Dec. 17 2009:
Black hole dynamical horizons in numerical relativity: application to gravitational collapse scenarios
LISA France meeting, Nice, Nov. 9 2009:
Black holes in numerical relativity: formulations and issues
CoCoNuT workshop, Valencia, Nov. 4 2009:
Metric excision in core collapse simulations: principles and challenges
12th Marcel Grossmann meeting, Paris, Jul. 15 2009:
Quasi-local horizons and the computation of black hole spacetimes
PhD defense (in French) (Meudon, France), June 2009:
Quelques aspects des horizons de trous noirs en relativité numérique.
Young researchers day of LUTh, Meudon, June 3. 2009:
Local properties for black holes horizons: the stationary case
LISA France meeting, Paris, Feb. 27 2009:
Computation of quasi-local black hole horizons
Conference "Numerical modelling of astrophysical sources of gravitational radiation", Valencia, Sep. 11 2008:
Local properties for black holes in the (3+1) fully constrained formalism of Einstein Equations
SF2A congress, Paris, July 4. 2008:
Local properties for black holes: the spacetime close to the horizon
Conference "Mathematics for general relativity", Meudon, Jan. 30 2008:
Penrose-like geometrical inequalities in axisymmetric spacetimes (in French).
PhD Thesis (in French)
Quelques aspects des horizons de trous noirs en relativité numérique , Thèse de l'Université Paris Diderot (Paris VII), 30 juin 2009. |
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